A validation issue existed in the entitlement verification. This issue was addressed with improved validation of the process entitlement. This issue is fixed in iOS 12.4, tvOS 12.4. A malicious application may be able to restrict access to websites.
Source: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-8698
Reference (s):
- https://support.apple.com/HT210346
- https://support.apple.com/HT210351